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Date: Wed, 7 Jul 2010 11:05:36 -0400 From: "J. Bruce Fields" <bfields@...ldses.org> To: Andreas Dilger <andreas.dilger@...cle.com> Cc: "Aneesh Kumar K. V" <aneesh.kumar@...ux.vnet.ibm.com>, Neil Brown <neilb@...e.de>, hch@...radead.org, viro@...iv.linux.org.uk, adilger@....com, corbet@....net, serue@...ibm.com, hooanon05@...oo.co.jp, linux-fsdevel@...r.kernel.org, sfrench@...ibm.com, philippe.deniel@....FR, linux-kernel@...r.kernel.org Subject: Re: [PATCH -V14 0/11] Generic name to handle and open by handle syscalls On Wed, Jul 07, 2010 at 01:40:53AM -0600, Andreas Dilger wrote: > On 2010-07-06, at 11:09, Aneesh Kumar K. V wrote: > > On Tue, 6 Jul 2010 12:10:02 -0400, "J. Bruce Fields" <bfields@...ldses.org> wrote: > >> ... I don't understand why both need to come in the same system call. > >> Is it purely an efficiency question? If so, why do you expect this to > >> be significant? > > > > Since we know that system wide file handle should include a file system > > identifier and a file identifier my plan was to retrieve both in the > > same syscall. > > Won't having it be in a separate system call be racy w.r.t. doing the pathname lookup twice? It'll be rare that a server will want to *just* get a filehandle; normally it will at least want to get some attributes at the same time. So I think it will always need to open the file first and then do the rest of the operations on the returned filehandle. --b. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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